VOICE COIL MOTOR DRIVERS
Underhung coil Gap’s height is greater than the coil’s height. Try our pull force calculators. A typical example can be found below: Care should be taken that the leads are mechanically secured to the moving assembly preferably at some distance from the soldered joints solder fuses the strands together, and leads to large stresses being applied to the termination pins, or to fatigue adjacent to the fuesed portion of the wire. This method keeps the magnetic flux that the coil experiences, constant over the coil’s normal excursion range.
|Date Added:||23 July 2012|
|File Size:||26.11 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
The actual wire employed in voice coil winding is almost always copper, with an electrical insulation coating, and in some cases, moror adhesive overcoat.
Where maximum sensitivity or extended high frequency response is required from a loudspeaker, aluminium wire may be substituted, to reduce the moving mass of the voice coil motor.
Disassembly of motor vocie void warranty. If the coil is overdriven it may leave the gap, generating significant distortion and losing the heat-sinking benefit of the steel, heating rapidly.
A few voice coil motor of customizations available are: A non-commutated DC linear actuator, typically referred to as a voice coil, is capable voice coil motor a displacement of up to 5 inches, whereas most actuators have displacements up to 2 inches.
The non-commutated motor construction increases reliability. If you motor is supplied with drilled and tapped mounting holes, refer to the recommended seating torque for screws in voice coil motor document.
The differences, advantages and disadvantages of both methods are listed below.
Some voice coil motor designs include aluminium heat-sink rings above and below the magnet gap, to improve conduction cooling, significantly improving power handling. Plated steel magnet housing assembly, nylon or like material wound bobbin assembly.
Voice coil motors operate on the principal of the Lorentz force equation: They voice coil motor currently moor for a wide range of applications, including moving much larger masses. In this application, a very lightweight coil of wires is mounted within a strong magnetic field produced by permanent rare-earth magnets. As successful as these dark brown plastic vlice were for most hi-fi voice voice coil motor, they also had some less attractive properties, principally their cost, and an unfortunate tendency to soften when hot.
The amount of force that is produced is directly proportional to the magnitude of the input current. The pumping action of the cone and mitor draws in and expels cool air.
Voice coil – Wikipedia
The force generated by a voice coil motor or actuator is relatively constant throughout the stroke of the actuator, with minor dips at the voice coil motor and end of the travel length. These motors consist of two separate parts; the magnetic housing and the coil.
Voice Coil Motors address requirements regarding very good controllability on force, low hysteresis, audible noise, small overshoot etc. Motor should be kept dry and relatively free of contamination. Voice coil motor hardware in various lengths and styles is available and may be obtained at.
Voice Coil Actuators
A linear voice coil actuator is voice coil motor for short motkr typically less than 2 inches closed loop servo applications. It has very low electrical and mechanical time constants.
Simplicity of construction Very low hysteresis Small size High accelerations No cogging voice coil motor commutation. Some environments like vacuum or space require specific attention during conception, in order to evacuate coil losses. Voice coil actuators VCAs are direct drive, limited motion devices that utilize a permanent magnet field and coil winding conductor to produce a force that is proportional to the current applied voice coil motor the coil. This field should be left blank.
These actuators can also be used for precise force control because of the linear force versus current characteristics.
Voice Coil Motors & Actuators
Because of the very low inductance of the actuator, a DC linear servo amplifier is required to provide power to the Voice Coil. Voice coil motor Coil Actuators are bidirectional with similar behaviour voice coil motor both directions. Cool coils are made with surface-sealed bobbin and collar materials so they may be immersed in a ferrofluid which assists in cooling the coil, by conducting heat away from the coil and into the magnet structure.
Please help to improve this article by introducing more precise citations.
An inner core of ferromagnetic material set along the axial centerline of the coil, joined at one end to the permanent magnet assembly, is used to complete the magnetic circuit. Newer designs utilized voice coil motor axial length gaps, lower magnetic field ccoil, and shorter coils using fewer turns of wire.